<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea name="" id="" maxlength="120" placeholder="请输入要评论的内容(最多120字)" v-model="msg"></textarea>
    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>
    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,index) in commentList" :key="item.add_time">
        <div class="cmt-title">
          第{{index+1}}楼&nbsp;&nbsp;用户:{{item.user_name}}&nbsp;&nbsp;发表时间:{{item.add_time | dateFormat}}
        </div>
        <div class="cmt-body">
          {{item.content==='undefined'||item.content==='' ? '此用户懒得评论...' : item.content}}
        </div>
      </div>
    </div>
    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
  import {Toast} from 'mint-ui';

  export default {
    data() {
      return {
        pageindex: 1,//默认展示第一页数据
        commentList: [],//所有的评论数据
        msg: ''//评论输入的内容
      }
    },
    created() {
      this.getComments();
    },
    methods: {
      getComments() {//获取评论
        this.$http.get('api/getcomments/' + this.id + '?pageindex=' + this.pageindex)
          .then(result => {
            if (result.body.status === 0) {
              this.commentList = this.commentList.concat(result.body.message);//加载更多数据是在原来的数据后面追加
            } else {
              Toast('获取评论失败');
            }
          })
      },
      getMore() {
        //加载更多
        this.pageindex++;
        this.getComments();
      },
      postComment() {
        //发表评论
        //校验是否为空
        if (this.msg.trim().length === 0) {
          Toast('评论不能为空');
          this.msg = '';
          return;
        }
        this.$http.post('api/postcomment/' + this.id,
          {
            content: this.msg.trim()
          }).then(function (result) {
          if (result.body.status === 0) {
            //1.拼接出一个评论对象
            var cmt = {
              user_name: '匿名用户',
              add_time: Date.now(),
              content: this.msg.trim()
            };
            this.commentList.unshift(cmt);
            this.msg = '';
          } else {
            Toast('评论发表失败');
          }
        });
      }
    },
    props: ['id']
  }
</script>

<style lang="scss" scoped>
  .cmt-container {
    h3 {
      font-size: 18px;
    }

    textarea {
      font-size: 14px;
      height: 85px;
      margin: 0;
    }

    .cmt-list {
      margin: 5px 0;

      .cmt-item {
        .cmt-title {
          background-color: #ccc;
          font-size: 13px;
          line-height: 30px;
        }

        .cmt-body {
          line-height: 35px;
          text-indent: 2em;
        }
      }
    }
  }

</style>